package org.itstack.demo.netty.sever;

import com.alibaba.fastjson.JSON;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http.websocketx.*;
import io.netty.util.CharsetUtil;
import org.itstack.demo.netty.domain.ClientMsgProtocol;
import org.itstack.demo.netty.util.ChannelHandler;
import org.itstack.demo.netty.util.MsgUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyServerHandler extends ChannelInboundHandlerAdapter {

    private Logger logger = LoggerFactory.getLogger(MyServerHandler.class);

    private WebSocketServerHandshaker handshaker;

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        SocketChannel socketChannel = (SocketChannel) ctx.channel();
        System.out.println("连接报告开始：");
        System.out.println("连接报告信息：有一个客户端连接到本服务端");
        System.out.println("连接报告IP：" + socketChannel.localAddress().getHostString());
        System.out.println("连接报告port：" + socketChannel.localAddress().getPort());
        System.out.println("连接报告完毕");
        ChannelHandler.channelGroup.add(ctx.channel());
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        logger.info("客户端断开丽连接{}", ctx.channel().localAddress().toString());
        ChannelHandler.channelGroup.remove(ctx.channel());
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        // http
        if (msg instanceof FullHttpRequest) {
            FullHttpRequest httpRequest = (FullHttpRequest) msg;

            if (!httpRequest.decoderResult().isSuccess()) {

                DefaultFullHttpResponse httpResponse = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.BAD_REQUEST);

                // 返回应答给客户端
                if (httpResponse.status().code() != 200) {
                    ByteBuf buf = Unpooled.copiedBuffer(httpResponse.status().toString(), CharsetUtil.UTF_8);
                    httpResponse.content().writeBytes(buf);
                    buf.release();
                }

                // 如果是非keep-alive，关闭连接
                ChannelFuture channelFuture = ctx.channel().writeAndFlush(httpResponse);
                if (httpResponse.status().code() != 200) {
                    channelFuture.addListener(ChannelFutureListener.CLOSE);
                }

                return;
            }

            WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory("ws:/" + ctx.channel() + "/websocket", null, false);
            wsFactory.newHandshaker(httpRequest);

            if (null == handshaker) {
                WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());
            } else {
                handshaker.handshake(ctx.channel(), httpRequest);
            }

            return;
        }

        // ws
        if (msg instanceof WebSocketFrame) {
            WebSocketFrame webSocketFrame = (WebSocketFrame) msg;

            // 关闭请求
            if (webSocketFrame instanceof CloseWebSocketFrame) {
                handshaker.close(ctx.channel(), ((CloseWebSocketFrame) webSocketFrame).retain());
                return;
            }

            // ping请求
            if (webSocketFrame instanceof PingWebSocketFrame) {
                ctx.channel().write(new PongWebSocketFrame(webSocketFrame.content().retain()));
                return;
            }

            // 只支持文本格式，不支持二进制格式
            String request = ((TextWebSocketFrame) webSocketFrame).text();
            System.out.println("服务端收到：" + request);
            ClientMsgProtocol clientMsgProtocol = JSON.parseObject(request, ClientMsgProtocol.class);

            // 请求个人信息
            if (1 == clientMsgProtocol.getType()) {
                ctx.channel().writeAndFlush(MsgUtil.buildMsgOwner(ctx.channel().id().toString()));
                return;
            }

            // 群发消息
            if (2 == clientMsgProtocol.getType()) {
                TextWebSocketFrame textWebSocketFrame = MsgUtil.buildMsgAll(ctx.channel().id().toString(), clientMsgProtocol.getMsgInfo());
                ChannelHandler.channelGroup.writeAndFlush(textWebSocketFrame);
            }

        }

    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();
        logger.info("异常信息：\r\n" + cause.getMessage());
    }
}
